public class Main {
    public static void main(String[] args) {
        CharSequence cs = " a  b \\u2000 c ";
        cs.chars().forEach(System.out::println);
        System.out.println("---------");
        cs.codePoints().forEach(System.out::println);
        cs = "\u2000";
        System.out.println(cs.isEmpty());

        String s = """
                \u2000 unicode 空白字符
                """;

        System.out.println('\u2000');
        System.out.println("\\u2000");
        System.out.println("\u2000");


    }
}
